Radial Blur Problem in Sony Vegas Pro 2011

[saruto23]

So whenever I used radial blur in Sony Vegas Pro 11, it messes up the quality of the video. And I am not sure exactly what is wrong. I have disabled the resample and it does not help. Here is a video showing how the quality dips if I add a radial blur effect to the clip. Keep in mind, the strength of the blur is set to 0:

http://www.youtube.com/watch?v=rzpkDiFUHOc

Any advice or tips that could help reduce the dip in quality?

[HalOfBorg]

It has been my experience that many of the effects in Vegas have an affect even when set to 'Zero'. Simply adding it changes the video.